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CN102791974B - Breather pipe structure for a liquid reductant storage tank - Google Patents

Breather pipe structure for a liquid reductant storage tank Download PDF

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Publication number
CN102791974B
CN102791974B CN201180011275.XA CN201180011275A CN102791974B CN 102791974 B CN102791974 B CN 102791974B CN 201180011275 A CN201180011275 A CN 201180011275A CN 102791974 B CN102791974 B CN 102791974B
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CN
China
Prior art keywords
liquid
pipe
storage tank
liquid reducer
breathing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201180011275.XA
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Chinese (zh)
Other versions
CN102791974A (en
Inventor
尼个崎真
水户卓也
益子达夫
小平和宏
户塚章浩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Publication of CN102791974A publication Critical patent/CN102791974A/en
Application granted granted Critical
Publication of CN102791974B publication Critical patent/CN102791974B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066Selective catalytic reduction [SCR]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/10Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406Storage means for substances, e.g. tanks or reservoirs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406Storage means for substances, e.g. tanks or reservoirs
    • F01N2610/1413Inlet and filling arrangements therefore
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1466Means for venting air out of conduits or tanks
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

In the provided breather pipe structure for a liquid reductant storage tank, the supply of the liquid reductant is not impeded even if the breather pipe is blocked due to the liquid reductant having frozen. In the provided structure, a breather pipe (20) that takes in and expels air is attached to the top of a liquid reductant storage tank (10) that stores a liquid reductant (5). The bottom end (20c) of the breather pipe (20) inside the liquid reductant storage tank (10) is provided alongside an engine cooling-water pipe (16) also provided inside the liquid reductant storage tank (10).

Description

The breather pipe structure of liquid reducer storage tank
Technical field
The present invention relates to liquid reducer storage tank, store the liquid reducer that the NOx in the Exhaust Gas of motor is reduced, be specifically related to breathing pipe (breather pipe) structure for sucking, discharge the liquid reducer storage tank of air according to the liquid measure in liquid reducer storage tank.
Background technique
As the exhaust gas purifying system purified for the NOx in the Exhaust Gas to diesel engine (diesel engine), such as exploitation has the used urea SCR system (such as with reference to patent documentation 1,2) using selective reduction catalyzer (SCR).
Liquid reducer i.e. such as urea water (urea concentration 32.5%) is supplied to the Exhaust Gas upstream of SCR device by this used urea SCR system, and utilize the heat hydrolyze urea of Exhaust Gas and generate ammonia, purify by this ammonia and by SCR catalyst reducing NOx.
As shown in Figure 4, the gas exhaust manifold 2 of diesel engine 1 is connected with outlet pipe 3, the SCR device 4 of NOx reduction is connected with in the midway of this outlet pipe 3, and the Exhaust Gas upstream of this SCR device 4 is connected with reducing agent supplying pipe portion 8, this reducing agent supplying pipe portion 8 possesses the nozzle 7 of the SCR catalyst 6 for liquid reducer 5 (urea water) being supplied to SCR device 4.
The nozzle 7 in this reducing agent supplying pipe portion 8 is connected with liquid reducer storage tank 10 via liquid reducer supplying pipe 9.This liquid reducer storage tank 10 to be configured to liquid reducer 5 by liquid delivering pump 11 via liquid reducer supplying pipe 9 force feed to nozzle 7.
Further, liquid reducer storage tank 10 is provided with ascending pipe (filler pipe) 12, by unloading the lid 13 that this ascending pipe 12 is arranged, and can by ascending pipe 12 to liquid make-up reducing agent 5 in tank 10.
This liquid reducer storage tank 10 is arranged on the narrow place of the side near the outlet pipe 3 of vehicle, in order to easily carry out the injection of liquid reducer 5, ascending pipe 12 is installed in the mode that the rising wood 10e of the vehicle side at liquid reducer storage tank 10 tilts obliquely upward.
Further, the top of liquid reducer storage tank 10 is provided with the breathing pipe 14 for sucking air, discharge air from outside according to the liquid level change in tank.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication JP2000-27627 publication
Patent documentation 2: Japanese Unexamined Patent Publication JP2005-83223 publication
Summary of the invention
The problem that invention will solve
But in very cold place etc., the urea water as liquid reducer 5 is freezed 11 DEG C below freezing time.Thus as shown in Figure 3, on the pipe unit 15 at the top of liquid reducer storage tank 10, in order to thaw to the liquid reducer 5 in liquid reducer storage tank 10, be provided with the engine cooling water pipe arrangement 16 being formed as U-shaped etc., engine cooling water (LLC) is flowed from the engine cooling water pipe arrangement 16s of supply side to the engine cooling water pipe arrangement 16d of discharge side, thus can the liquid reducer 5 freezed be thawed.
But, namely allow to thaw to the liquid reducer 5 in liquid reducer storage tank 10, but as shown in Fig. 3, Fig. 2 (b), when freezing there is liquid reducer 5c in the underpart 14c of breathing pipe 14, cannot be thawed by engine cooling water pipe arrangement 16, breathing pipe 14 still blocks.When the gas phase portion G in liquid reducer storage tank 10 becomes air-tight state, the liquid delivering pump 11 of SCR system can not extracting liquid reducing agent 5, thus produces rough sledding such as cannot spraying.
Therefore, object of the present invention for solving the problem, even if when providing a kind of breathing pipe at liquid reducer storage tank to block because liquid reducer freezes, the breather pipe structure of the liquid reducer storage tank of feed fluid reducing agent also can not be affected.
For the means of dealing with problems
In order to reach above-mentioned purpose, the present invention is a kind of breather pipe structure of liquid reducer storage tank, at the top of the liquid reducer storage tank of storing liquid reducing agent, breathing pipe air being carried out to air-breathing exhaust is installed, wherein, the underpart of the breathing pipe in liquid reducer storage tank is thawed along the liquid reducer arranged in liquid reducer storage tank to arrange with pipe arrangement.
In the present invention, preferably on above-mentioned breathing pipe, exhaust port is provided with.
In the present invention, the underpart of optimizing breathing pipe is arranged between the liquid level that the liquid level in lower ending opening portion of closing ascending pipe and liquid overflows from the inlet of the upper end of ascending pipe.
In the present invention, preferred above-mentioned exhaust port is formed as the diameter that the air when injecting liquid reducer in liquid reducer storage tank can not be forced out by breathing pipe.
In the present invention, liquid reducer thaw with pipe arrangement by flowing have the engine cooling water pipe arrangement of engine cooling water to form.
Invention effect
According to the present invention, effect useful as follows can be obtained, to arrange with pipe arrangement because breathing pipe thaws along liquid reducer set in liquid reducer storage tank, even if the liquid reducer therefore freezed in breathing pipe freezes, also can the liquid reducer that this freezes be thawed, in addition owing to arranging exhaust port on breathing pipe, though therefore in breathing pipe liquid reducer freeze and under the state blocked, also can carry liquid reducer insusceptibly.
Accompanying drawing explanation
Fig. 1 is the sectional drawing representing an embodiment of the invention.
Fig. 2 is the zoomed-in view of the present invention and existing breathing pipe.
Fig. 3 is the view of the breather pipe structure representing existing liquid reducer storage tank.
Fig. 4 be illustrate liquid reducer storage tank the figure of used urea SCR system that is suitable for.
Embodiment
Below, a preferred embodiment of the present invention is described in detail based on accompanying drawing.
Fig. 1 is the view of a mode of execution of the breather pipe structure representing liquid reducer storage tank of the present invention.
Although eliminate in Fig. 1, but liquid reducer storage tank 10 is provided with liquid reducer supplying pipe, as as described in Fig. 4, by liquid delivering pump 11 via liquid reducer supplying pipe 9 by liquid reducer 5 force feed to nozzle 7, and the liquid reducer 5 that will be made up of urea water (concentration 32.5%) sprays to the upstream side of SCR device 4.
This liquid reducer storage tank 10 eliminates bottom and only indicates top, the right side (or left side) of vehicle is positioned at the side face 10r in the left side seen in FIG, and the mode that the side face 10c on right side is positioned at vehicle center side configures, and top has top part 10t at central side, the upper surface portion 10u slightly lower than top part 10t is formed with via rake 10i towards right side (or left side), the rising wood 10e of the side face 10r in this upper surface portion 10u and left side arranges the ascending pipe 12 for injecting liquid reducer 5 with tilting about 45 degree obliquely upward, and the lid 13 of the inlet 12f closing this ascending pipe 12 is installed by screw thread etc.
The top part 10t of liquid reducer storage tank 10 is provided with pipe unit 15, and this pipe unit 15 liquid reducer be provided with for thawing to the liquid reducer 5 in liquid reducer storage tank 10 thaws and uses pipe arrangement.It is the structure being provided with heater in pipe arrangement that this liquid reducer thaws with pipe arrangement, or the engine cooling water pipe arrangement 16 being formed as U-shaped passed through by engine cooling water is as shown in the figure formed.This engine cooling water pipe arrangement 16 is made up of the engine cooling water pipe arrangement 16s of supply side and the engine cooling water pipe arrangement 16d of discharge side, and from engine cold water pipe 16s inflow engine cooling water (LLC) of supply side, the liquid reducer 5 freezed is heated, and discharge from the engine cooling water pipe arrangement 16d of discharge side.
Pipe unit 15 air be provided with for the gas phase portion G to liquid reducer storage tank 10 carries out the breathing pipe 20 of air-breathing exhaust.End 20b outside the liquid reducer storage tank 10 of breathing pipe 20 is to atmosphere opening, and the breathing pipe 20a in tank is bent to form in the mode of the engine cooling water pipe arrangement 16s along supply side.Further, canful liquid level L is arranged in the position of the underpart 20c of the breathing pipe 20a in tank.
The position of the underpart 20c of this breathing pipe 20 is set between below the liquid level Lmax that more than the liquid level Lmin of the lower ending opening portion 12a closing ascending pipe 12 and liquid overflows from the inlet 12f of the upper end of ascending pipe 12, and the position of its underpart 20c is the liquid level L of canful state.
And, be positioned on the breathing pipe 20a above canful liquid level L and be provided with exhaust port 22.This exhaust port 22 is formed as when injecting liquid reducer 5, the diameter that the air in liquid reducer storage tank 10 can not be forced out by breathing pipe 20.
The following describes effect of the present invention.
When the used urea SCR system of normally used SCR device is in action, liquid reducer 5 supplies to the upstream side of SCR device, the liquid level of the liquid reducer 5 in liquid reducer storage tank 10 declines, but owing to passing through breathing pipe 20 to gas phase portion G air supply, therefore remain on barometric pressure in liquid reducer storage tank 10.
Then, when using in very cold place, as shown in Fig. 2 (a), when the liquid reducer 5c that the underpart 20c of breathing pipe 20 is frozen blocks, the heat of the engine cooling water flowed in the engine cooling water pipe arrangement 16s of the supply side of engine cooling water pipe arrangement 16 is utilized to thaw rapidly, thus the blocking of breathing pipe 20 is eliminated, the air-breathing exhaust of air can be carried out by breathing pipe 20, therefore can not can't get out due to the air in liquid reducer storage tank 10 and affect to used urea SCR system feed fluid reducing agent 5.
And in the existing breathing pipe 14 shown in Fig. 2 (b), its underpart 14c is when frozen liquid reducer 5c blocks, even if engine cooling water flows in the engine cooling water pipe arrangement 16s of the supply side of engine cooling water pipe arrangement 16, liquid reducer 5 in liquid reducer storage tank 10 is thawed, but because the liquid reducer 5c freezed of the underpart 14c of breathing pipe 14 is not thawed, the supply of the liquid reducer 5 to used urea SCR system therefore cannot be carried out.
And in the present invention, be provided with enough little diameter in the position in the top portion of canful liquid level L than breathing pipe 20, the exhaust port 22 of diameter that air namely when injecting liquid reducer in liquid reducer storage tank 10 can not be forced out by breathing pipe 20, for being eliminated the abnormal condition (Emergency) of period in the blocking of breathing pipe 20, therefore, it is possible to taken a breath by this exhaust port 22, therefore, it is possible to prevent gas phase portion G from becoming air-tight state, and can prevent the SCR system when abnormal condition can not pumping liquid reducing agent 5.
And, diameter due to this exhaust port 22 is formed as air in liquid reducer storage tank 10 not by diameter that breathing pipe 20 is forced out, therefore when injecting liquid reducer 5 from ascending pipe 12, when its liquid level arrive breathing pipe 20 underpart 20c and when becoming canful liquid level L, the resistance when air that this exhaust port 22 is configured to gas phase portion G is discharged from breathing pipe 20 by exhaust port 22, therefore, it is possible to the position of restriction canful liquid level L.
In addition, although resistance when exhaust port 22 forms exhaust, the position of canful liquid level L can be limited, because exhaust port 22 can be taken a breath, under the state that therefore also can block at the liquid reducer 5c that breathing pipe 20 is frozen, be filled to the liquid level L of canful.Now, when after the liquid level Lmin arriving the lower end closing ascending pipe 12, if slowly inject from the liquid reducer 5 of ascending pipe 12 injection, then can be vented by exhaust port 22, canful liquid level L can be arrived.
Like this, the present invention makes the lower end 20c of the breathing pipe 20 according to the level change of the liquid reducer 5 in liquid reducer storage tank 10, air in tank being carried out to air-breathing exhaust thaw with pipe arrangement along liquid reducer such as engine cooling water pipe arrangement 16 grade, even if thus liquid reducer 5c freezes at underpart 20c and blocks breathing pipe 20, also can thaw to it.And before thawing, due to can from breathing pipe 20 by exhaust port 22 by air intake to gas phase portion G, therefore, it is possible to SCR system can not the situation of pumping liquid reducing agent 5 under preventing abnormal condition.
Symbol description
5 liquid reducers
10 liquid reducer storage tanks
20 breathing pipes
20c lower end
22 exhaust ports

Claims (3)

1. a breather pipe structure for liquid reducer storage tank, is provided with at the top of the liquid reducer storage tank of storing liquid reducing agent breathing pipe air being carried out to air-breathing exhaust, it is characterized in that,
The underpart of the breathing pipe in liquid reducer storage tank thaws along the liquid reducer of supply side and to be bent to form with pipe arrangement, with pipe arrangement, the liquid reducer be frozen in the above-mentioned underpart of above-mentioned breathing pipe to be thawed to be thawed by the liquid reducer that arranges in liquid reducer storage tank, and the underpart of the above-mentioned bending of ratio in liquid reducer storage tank breathing pipe is by the top provided with exhaust port.
2. the breather pipe structure of liquid reducer storage tank according to claim 1, is characterized in that,
The underpart of above-mentioned breathing pipe is arranged between the liquid level that the liquid level in the lower ending opening portion closing ascending pipe and liquid overflows from the inlet of the upper end of ascending pipe.
3. the breather pipe structure of liquid reducer storage tank according to claim 1, is characterized in that,
Liquid reducer thaw with pipe arrangement by flowing have the engine cooling water pipe arrangement of engine cooling water to form.
CN201180011275.XA 2010-02-26 2011-02-23 Breather pipe structure for a liquid reductant storage tank Active CN102791974B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2010042744A JP5564989B2 (en) 2010-02-26 2010-02-26 Breather pipe structure of liquid reductant storage tank
JP2010-042744 2010-02-26
PCT/JP2011/053983 WO2011105427A1 (en) 2010-02-26 2011-02-23 Breather pipe structure for a liquid reductant storage tank

Publications (2)

Publication Number Publication Date
CN102791974A CN102791974A (en) 2012-11-21
CN102791974B true CN102791974B (en) 2015-06-03

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US (1) US9964015B2 (en)
EP (1) EP2541008B1 (en)
JP (1) JP5564989B2 (en)
CN (1) CN102791974B (en)
WO (1) WO2011105427A1 (en)

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Publication number Publication date
JP5564989B2 (en) 2014-08-06
JP2011179362A (en) 2011-09-15
US20120318813A1 (en) 2012-12-20
US9964015B2 (en) 2018-05-08
WO2011105427A1 (en) 2011-09-01
CN102791974A (en) 2012-11-21
EP2541008B1 (en) 2015-08-26
EP2541008A4 (en) 2014-04-09
EP2541008A1 (en) 2013-01-02

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